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k in (-oo:+oo)
15 = (0.5/3.5)*k // - (0.5/3.5)*k
15-((0.5/3.5)*k) = 0
15-0.14285714*k = 0
15-0.14285714*k = 0 // - 15
-0.14285714*k = -15 // : -0.14285714
k = -15/(-0.14285714)
k = 105.0000021
k = 105.0000021
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